近日，西班牙巴塞罗那大学的Marc Rovirola与Montserrat Guilleumas等人合作并取得一项新进展。经过不懈努力，他们对原子电子电路中捕获的超冷偶极玻色子进行研究。相关研究成果已于2024年6月25日在国际知名学术期刊《物理评论A》上发表。

该研究团队考虑了具有面内偶极子取向的少数极玻色子的环状三阱势。通过对角化扩展的玻色-哈伯德哈密顿量，研究人员研究了系统基态性质如何随旋转偶极角以及现场和偶极-偶极相互作用强度的变化而发生改变。研究发现，偶极相互作用的各向异性以及偶极相互作用与现场相互作用之间的竞争，共同决定了系统基态的多样性。

更重要的是，不同位点间的纠缠状态也受到粒子数量的显著影响。研究人员通过研究不同偏振角下的凝聚分数和相干特性进一步表征了该体系，凸显了偶极相互作用作为操纵工具可能产生的影响。

附：英文原文

Title: Ultracold dipolar bosons trapped in atomtronic circuits

Author: Marc Rovirola, Héctor Briongos-Merino, Bruno Juliá-Díaz, Montserrat Guilleumas

Issue&Volume: 2024/06/25

Abstract: We consider a ring-shaped triple-well potential with few polar bosons with in-plane dipole orientation. By diagonalizing the extended Bose-Hubbard Hamiltonian, we investigate the ground-state properties of the system as we rotate the dipole angle and vary the on-site and dipole-dipole interaction strengths. We find that the anisotropic character of the dipolar interactions, as well as the competition between dipole and on-site interactions, leads to different ground states and that the entanglement between sites also depends on the number of particles. We further characterize the system by studying the condensed fraction and coherence properties for different polarization angles, highlighting the possible effect of the dipolar interaction as a manipulation tool.

DOI: 10.1103/PhysRevA.109.063331

Source: https://journals.aps.org/pra/abstract/10.1103/PhysRevA.109.063331